① altogether是一個詞,為副詞,意為"完全(completely),總的來說(on the whole)"。
They altogether agree to the proposal. 他們完全同意那個建議。
Altogether,it is a good book. 總的來說,這是一本好書。
② all together是兩個詞,為副詞短語,意為"同時都,一道"。
Please don't ask her questions all together. 請不要一起向她問問題。
They left all together. 他們一起走了。
altogether和all together均可表示"一共,總共"。
There were altogether/all together twenty students present at the meeting. 總共有20名學生出席了會議。